Heat-exchange roll



Aug. 13, 1929. Q MOXLEY 1,724,676

HEAT EXCHANGE ROLL Filed March l, 1928 lNvvENToR Patented Aug. 13, 1929.

. UNITED ASTATES PATENT OFFICE.

CLUD HO, 0f FORD CITY, PENNSYLVANIA,.ASSIGNOB T0 PITTSBURGH PLATE GLASS COHYANY, AACOBPORATIQN OF PENNSYLVANIA. l

' `HEAT-EXCHANGE BOLL.

sppueafien nien time i, 192s. semi no. 258,265.

The invention relates to rolls and particularly to fluid cooled rolls for use in the making of plate lass, although the rolls may be'used for ot er purposes. Itph-as for l its principal objects, the provision of a roll construction having improved means for circulating fluid therethrough and maintaining it at a uniform temperature. One embodiment'of the invention is illustrated in 10 the accompanying drawings, wherein:

Figure l is a vertical section through a roll uipped with the-im roved construction. `g. 2 is an enlarged) section through a relief valve on the expansion chamber taken in a plane at right angles to that of Fi 1. And Fig. 3 is a section on the line II -III of Fig. 1.

The roll 1 is shown as supported in a pair of bearin 2, 3 above the roll table 4 with a sheet o glass 5 between the roll and roll table, this being one of a large number of ways in which the roll may be used. The roll, as shown, is made in three parts, the center part 6 and the end parts 7 and 8. The part 8 is provided with a closure late 9 having an end 10 inte therewit to which a connection'is ma e with a tumbler shaft in order to give the roll its movement of rotation.

Clamped to the outer end of the other end member 7 is an expansion chamber 11, having the cover plate 12, such chamber besecured in position by means of the stud bo ts 13 which extend through the walls of the chamber and into the end of the member 7. Extending transversely of the chamber are three pipe -connections 14, 15 and 16 with their inner ends 'in opposition to three openings through a header 17, which is secured rigidly in the end of themember' 7. This Vheader 17 carries the three pipes 18, 19 aud20, which are in Pipes .14#

.with and communicate with the 15 and 16, the center pipe 18 terminating at the center of the roll cavity, while the other two pipes 19 and 20 terminate adjacent the ends of the roll' cavity, the pipes being supported from. the walls of the roll cavit by means of suitable spiders21. A fourt pipe 22 leads from a point ledjacent the YVouter periphery of the'Y roll cavity throu the header 17 and into the expansion ber 11. This pipe, after it .the point 36. The three een is held in adjusted position on the valve stem by means of the nuts y28. The valve 'is opened from time to time to permit the escape of accumulated gases by means of a cam member 29 carried upon the roll housing. .The valve stem 24fcai'ries at its end a roller 30 andupon each revolution of the roll and chamber 11 this roll is engaged by the cam 29 forcing the valve downward and opening it, the valve being closed by the spring 26 after the roll 30 moves fromy beneath the cam member.

Connected to theouter ends of the three pipe connections 14, 15 and 16 are the pi connections 31, 32 and 33. The' ipes and 33 are formed into coils and at their left hand ends into "the two-wayA connection 34 which constitutesthe inlet of the rota pump 35. Thefthird pipe 81Vis connecte to the outlet of the p p 85 at i thro h a pair of circular agevol 87 and 38 adjacent they ends of the coils and these sleeves are for rotation in the' bearings 39 and* 40 carried by the E xed standards 41 and 42. The sleeves 38 39 are extended laterally atY their inner ends intheformofdiscsandconnected by the transverse bars 45, thus providing en open-work casing carrying the coils 8 and 83. vIn this manner, the coils and pump are mounted to rotate with'the roll and in order to relieve the ipe connections of the strain ofrota tecoils s nd ump,a bracket46isempoyed,extendmgromthe sleeve 37 t6 the cover plate 12 of the expension chamber.

' The of the pump 35 is extended to the left in t e form of a trunnion 47, which is joui-nailed in the stand 48 and stand carries au electric motor 49 for driving theextend pump rotor. The shaft of the rotor is directly connected to the motor shaft 51 by means of the coupling 52.

In order to supply a `cooling means for the coils .32 and 33, the tank 52 is prov1ded in which the lower portions of the coils extend. This tank is. partially filled withthe liquid 53 which may be kept at any desired temperature ,by means of a circulation through the pipes 54 and 55,'one of which 1s an inlet pipe and the other an outlet ipe. In o eration, the coolin liquid is circu ated by t e pump 35 throug the pipe 31 to the pi e 18, which is arranged axially of' the rol, such pipe discharging into the roll at the center thereof. The iluid which is thus supplied to the middle of the roll is withdrawn at its two ends through the pipes 19 and 20, which pipes lead back to the coils l0 32 and 33, discharging at their left hand ends Ainto the inlet connections 34 ofthe pump. As the liquid circulates through the coils 32 and 33, it is cooled to any desired degree, depending u on the amount of cooling liquid circulated t rough the tank 52. Various liquids may be employed as the temperature regulating medium, water being employed if the temperatures are relatively low`,\while oil may be employed if such temperatures are relatively high. The inventionis equally applicable where it is desired to utilize the circulating iluid to heat the roll rather than to cool it, and in such case suitableheating means may be'supplied in theV tank 52, or burners may be provided which play upon the coils 32 and 33'. The ex ansionchamber 12 not onl takes care o the ases which it is desire to eliminate from t e system, but also provides a safety device which will give under the pressures induced incident to the expansion of the liquid in the system. Any other suitable safety 'devices may also be applied to the'system for relieving excess ressure. v

The removal oy the ases which collect in the'roll by means of t e vent pipe 22 is desirable, as pockets of gas-in the roll keep the -liquid out of contact with the metal and reduce the cooling eect of the liquid and prevent such eil'ectvfrom being uniformly applied. vThe spiral form of the vent pipe in the chamber 11 causes it to act as a umping means as the Parts rotate, thus ma "ng the withdrawal o the gas from the roll more effective. If the gases removed are combustible due to using` oil as a coolin or heating.

fluid, the valve device shown in ig. 2 is not employed as the gases might ignite from the hot lass. The body of gas which collects in the c amber 11 acts as a relief means-for pre# in the system. hen the `casting operation is discontinued for any considerable time, it becomes desirable to prevent the roll from cooling down, and at such time, the liquid in 2. In combination, a hollow roll mounted l for rotation, a circulating coil and a rotar pump mounted to rotate with the roll wit said coil in communication with the interior of the roll, temperature modifying means located so as to act upon said coil as it rotates, and means for driving the pump to ciiiulate .a iuid through the coil and the ro 3. In combination, a hollow roll mounted for rotation, a circulating coil and a rotar pump mounted to rotate with the roll wit said coil in communication with the interior of the roll, a cooling bath with which said coil contacts as it rotates, and means for drivin the pump to circulate a fluid throulg the coil-and the roll.

4u n combination, a hollow roll mounted vfor rotation, a circulating coil and a rotar pump vmounted to rotate with the roll wit said coil in communication with the interior of the roll, and with the axis of rotation of the pump rotor in alinement with the axis of rotation of the roll, and a motor for driving thev pum rotor to circulate fluid through the coil and the roll.

5,. In combination, a hollow roll mounted for rotation, a circulating coil vand a rotar` pump mounted to rotate with the roll wit said coil in communication with the interior of the roll, an expansion chamber also mounted to rotate with the roll and in communication with the interior of the roll, and

means for driving the pump to circulate a iluid through the coil and roll.

6. In combination, a hollow roll mounted for rotation, a circulating coil and a rotar pumpv mounted to rotate with the roll wit said coil in communication with the interior of the roll, anv expansion chamber also mounted to rotate with the roll and in communication with theinterior of theroll, a vent pipe leading froml the peripheral portion of the roll cavity to the expansion chamber, a relief outlet carried by the expansion chamber, means for o ening said outlet at intervals and means riving the pump to circulate a iuid through the coil and the roll. venting undue ressure from accumulating t 7. In combination a hollow roll mounted for rotation, a circulatingcoil and a rotar pump mountedtorotatmwiththe roll wit said coil in communication with tliiiiterior 0f the *roll'g infr-expansion chamber also.

mounted to rotate with the roll and in communication with the interior of the roll, a vent pipe leading from the peripheral portion of the roll cavity to the expansion chamber, a relief outlet carried by the expansion chamber, means for opening said outlet at intervals and means driving. the pump to circulate a fluid through the coil and the roll, said. vent pipe being arranged in the ex ansion cham rin the form of a spiral lea ng from the center thereof to the periphery.

8. Inv combination, a hollow roll mounted for rotation, a circulating coil and a rota pump mounted to rotate with the roll wit said coil in communication with the interior of the roll, an expansion chamber also mounted to rotate with the roll and in communication with the interior of the roll, a

vent pifpe leadin from the peripheral portlon o chamber, a relief outlet carried by the expension chamber, means operated b the rotation of the roll for opening said outletY 192s. ary CLAUD MOXLEY.

the rol e cavity to the expansion 20 

